Biphasic Resistive Pulses and Ion Concentration Modulation during Particle Translocation through Cylindrical Nanopores

Chen, Kaikai; Shan, Lei; He, S. T.; Hu, Guoqing; Meng, Yonggang; Tian, Yu

doi:10.1021/acs.jpcc.5b00047

Cited by 22 publications

(26 citation statements)

References 41 publications

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“…The surface charge density of SiN x nanopore was set as −0.005 C m −2 at pH 8 and 0.005 C m −2 at pH 2. [29,56] ICR phenomenon could be observed in both acidic and alkaline simulation. In pH 2, absolute magnitude of current at positive voltage was less than that at negative voltage, which was consistent with the experimental result.…”

Section: (6 Of 8)mentioning

confidence: 85%

Nonlinear Ion Transport through Ultrathin Metal–Organic Framework Nanosheet

Zhang

Cao

Cheng

et al. 2020

Adv Funct Materials

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The rational design of artificial solid-state nanopores is of great importance in the discovery of intriguing ion transport phenomena. 2D metal-organic framework (2D MOF) nanosheets with single crystallinity, aligned nanochannels, ultrathin thickness, and diverse functionalities are highly potential solid-state nanopores. An electrophoretic method is developed to successfully fabricate MOF nanopores supported by SiN x substrate, which is confirmed by high-resolution transmission electron microscopy. A giant gap around 4 V together with ionic current rectification is discovered in nonlinear voltage-activated current-voltage curves, revealing the synergy of the hydrophobic effect and charge effect in MOF nanopores. The charge effect embodies the different contribution current which results from the enrichment and depletion of ions in MOF nanopores by COMSOL simulation. Moreover, 2D MOF nanosheets with different surface charges, hydrophobicity, and pore sizes demonstrate the universality of nanopore fabrication and further confirm the synergistic mechanism. The nonlinear ion transport in the ultrathin MOF nanosheets will provide an opportunity to explore further applications in solid-state nanopores.

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Section: (6 Of 8)mentioning

confidence: 85%

Nonlinear Ion Transport through Ultrathin Metal–Organic Framework Nanosheet

Zhang

Cao

Cheng

et al. 2020

Adv Funct Materials

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“…Similarly,b yt heoretically analyzing the bubble-substrate interactions in 1mm NaCl of pH 3.0, 8.0 and 10.0 (Figure 4), the corresponding Y OTS values were determineda nd listed in Ta ble 1, showing that OTS-mica surfaceb ecomes more negatively charged with increasing solution pH. [22] It is noticeable that ad istinct jump-in behaviorw as observed in the interaction force curve for the case of 1mm NaCl of pH % 3.0, indicating that the bubble attached onto the hydrophobic substrate duringt he approachingp rocess. This bubble attachment phenomenono nto OTS-mica could arise from the fact that the weak EDL repulsion in this case was not able to resist the strongH Ba ttraction (with ad ecay length of D 0 % 1.0 nm here), which was different from the case of bubble-bubble interaction under the same condition where the EDL repulsion (Y Bub = À23 AE 3mV) was stronge nough to overcome the HB attraction between two air bubbles (with ad ecay length D 0 of % 0.3 nm) [15a, 16h, 17c] and thus stabilize the confined thin water film.…”

Section: Resultsmentioning

confidence: 99%

Probing the Effect of Salinity and pH on Surface Interactions between Air Bubbles and Hydrophobic Solids: Implications for Colloidal Assembly at Air/Water Interfaces

Cui

Shi

Zhang

et al. 2017

Chemistry An Asian Journal

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In this work, a bubble probe atomic force microscope (AFM) was employed to quantify the interactions between two air bubbles and between an air bubble and an octadecyltrichlorosilane (OTS)-hydrophobized mica under various aqueous conditions. The key parameters (e.g., surface potentials, decay length of hydrophobic attraction) were obtained by analyzing the measured forces through a theoretical model based on Reynolds lubrication theory and an augmented Young-Laplace equation by including effect of disjoining pressure. The bubble-OTS hydrophobic attraction with a decay length of 1.0 nm was found to be independent of solution pH and salinity. These parameters were further used to predict the attachment of OTS-hydrophobized particles onto the air/water interface, demonstrating that particle attachment driven by hydrophobic attraction could be facilitated by suppressing electrical double-layer repulsion at low pH or high salinity condition. This facile methodology can be readily extended to quantify interactions of many other colloidal particles with gas/water and oil/water interfaces, with implications for colloidal assembly at different interfaces in many engineering applications.

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“…[158][159][160] The increase in electric current is at least partially mediated by increased concentration of positive counterions, which are attracted by the negatively charged DNA into the pore. 161,162 Nevertheless, the microscopic origins of this non-intuitive phenomenon are not yet completely understood.…”

Section: Physics Of Confined Dna: From the Odijk To The De Gennes Regimementioning

confidence: 99%

Flow of DNA in micro/nanofluidics: From fundamentals to applications

et al. 2016

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Thanks to direct observation and manipulation of DNA in micro/nanofluidic devices, we are now able to elucidate the relationship between the polymer microstructure and its rheological properties, as well as to design new single-molecule platforms for biophysics and biomedicine. This allows exploration of many new mechanisms and phenomena, which were previously unachievable with conventional methods such as bulk rheometry tests. For instance, the field of polymer rheology is at a turning point to relate the complex molecular conformations to the nonlinear viscoelasticity of polymeric fluids (such as coil–stretch transition, shear thinning, and stress overshoot in startup shear). In addition, nanofluidic devices provided a starting point for manipulating single DNA molecules by applying basic principles of polymer physics, which is highly relevant to numerous processes in biosciences. In this article, we review recent progress regarding the flow and deformation of DNA in micro/nanofluidic systems from both fundamental and application perspectives. We particularly focus on advances in the understanding of polymer rheology and identify the emerging research trends and challenges, especially with respect to future applications of nanofluidics in the biomedical field.

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Biphasic Resistive Pulses and Ion Concentration Modulation during Particle Translocation through Cylindrical Nanopores

Cited by 22 publications

References 41 publications

Nonlinear Ion Transport through Ultrathin Metal–Organic Framework Nanosheet

Nonlinear Ion Transport through Ultrathin Metal–Organic Framework Nanosheet

Probing the Effect of Salinity and pH on Surface Interactions between Air Bubbles and Hydrophobic Solids: Implications for Colloidal Assembly at Air/Water Interfaces

Flow of DNA in micro/nanofluidics: From fundamentals to applications

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